| 释义 |
cissoid
cissoid (ˈsɪsɔɪd) n (Mathematics) a geometric curve whose two branches meet in a cusp at the origin and are asymptotic to a line parallel to the y-axis. Its equation is y2(2a – x)=x3 where 2a is the distance between the y-axis and this lineadj (Mathematics) contained between the concave sides of two intersecting curves. Compare sistroid[C17: from Greek kissoeidēs, literally: ivy-shaped, from kissos ivy]cissoid
cissoid[′sis‚ȯid] (mathematics) A plane curve consisting of all points which lie on a variable line passing through a fixed point, and whose distance from the fixed point is equal to the distance between the intersections of the line with two given curves. |